Improvement in separating lead from the precious metals



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sOLOMON W. KIRK, or: PHILADELPHIA, PENNSYLVANIA, ASSIGNOR To HIMSELF AND WILLIAM BAILEY, OI" SAME PLACE.

Letters Patent No. 109,743, dated November 29, 1870.

' lMPROVEMENT lN SEPARATI NG LEAD FROM THE PRECIOUS NlETALS.

The Schedule referred to in these Letters Patent and making part of the same.

I, SOLOMON W. KIRK, of the city and county of l'hiladelphia and State of Pennsylvania, have invented a certain Process for, Separating Lead from Precious Metals, of which the following is a specification.

I mix the black oxide of manganese with the melted lead, and force through the mass a stream of oxygen gas or atmospheric air, for the purpose of oxidizing the-lead with great rapidity and converting it into I do not wish to broadly claim the process, only when used for separating the baser from the precious metals,

' I claim as my inveution- .l. The process of applying black oxide of manganese, 01 any other In terial that will liberate oxygen at an incandescent heat, to melted lead, and forcing throiwh the mass a stream of oxygen gas or atmos- O pheric air, so as to separate the baser irom the'pre cious metals, substantially as described.

2. The process of forcing oxygen gas or atmospheric air through melted lead, so as to convert it with great rapidity into oxide 0E lead or litharge, for the purpose I of separating the gold or silver that it may contain,- substautially as specified.

\Vituesses: SOLOMON V. KIRK.

ISAAC R. OAKFORD, J. M. OOLGAN. 

